package com.yinggu.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class LoginFilter implements Filter {
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;
        Object user = req.getSession().getAttribute("user");
        if (user != null) {
            filterChain.doFilter(servletRequest,servletResponse);
        }else {
            resp.sendRedirect(req.getContextPath()+"/login.jsp");
        }
    }

    public void destroy() {

    }
}
